Pulley.



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CHARLES A. BRINLEY, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMER-I- CAN PULLEY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PULLEY.

Specification of Letters Patent.

Patented June 28, 1910.

To all whom it may concern:

Be it known that I, CHARLES A. BRINLEY, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Pulleys, whereof the following is a specification, reference being had to the accompanying drawings.

My invention relates to that class of pulleys in which inserts of material, such as cork, etc., having greater frictional resistance than the normal surface of the pulley itself, are employed.

In the accompanying drawings, Figure I, represents a partial view, in side elevation, of a pulley embodying my improvements. Fig. II, is a top or plan view of the pulley rim developed upon a plane, the scale being somewhat enlarged over that of Fig. I. Fig. III, is a transverse sectional view of the rim and adjacent portion of the spokes, on the line III, III, in Fig. I. Figs. IV, and V, are partial sectional views, on a still larger scale and taken upon the lines IV, IV, and V, V, in Fig. II, respectively illustrating the details of different arrangements of the distance pieces which may be employed conjunctively, or as alternatives. Figs. VI, and VII, are views in perspective of different forms of distance pieces.

My invention is especially adapted to the use of pulleys made of sheet steel, and therefore I have selected this type for illustration, but it will be understood that the invention is not necessarily restricted thereto.

Referrin to the drawings, 1, represents the hub of the pulley, and 2, the spokes thereof, which are attached by rivets 7, to the rib 3, lying in the median plane of the pulley rim, and formed by the pair of inwardly projecting radial flanges on the meeting edges of the segments 4, and 5, which constitute the inner peripheral elements of the pulley rim.

The outer peripheral element of the rim, which for brevity will be termed the outer rim, is formed of a segment 6, which preferably extends across the entire width thereof, instead of being divided as in the case of the inner rim, and which is separated from the latter by distance pieces 8, shaped and arranged as will hereafter be explained, the outer and inner rims being secured in the proper relation to one another, by clamping them against said distance pieces by approximately crescent-shaped, the concave face of the crescent conforming in curvature with the curvature of the orifices 10. Hence, when two of the distance pieces are arranged diametrically opposite to one another, as shown in the dotted lines at 8, 8, in Fig. II, and in proximity to the periphery of the opening, they embrace considerable arcs of said opening. Preferably the concave walls of the distance pieces are not placed directly in alinement with the corresponding portions of the edge of the opening, but are arranged as shown in Fig. IV, at a slightly greater radial distance from the center of the opening, so as to form an overhanging shoulder at these portions of the edge. Cylindrical inserts 11, formed of pieces of cork, or other similar substance having relatively high frictional characteristics, are forced into the openings,the piecesv being slightly larger in diameter than the openings, so that the material will be compressed by the edges of the latter, and will expand both above and below said edges, thus firmly seating the inserts in position, with their lower ends resting upon the inner rim. When thus arranged, it will be seen that the concave walls formed by the adjacent surfaces of the distance pieces embrace the inserts throughout arcs of relatively considerable extent and thus tend to hold said inserts against displacement under the strain due to the action of the belt thereon.

Instead of employing the crescent-shaped distance pieces shown in Figs. IV, and VI, I may employ annular ones 12, such as are shown in Figs. V, and VII, these being arranged in the relation to the openings 10, shown in Fig. II. In this instance instead of using a pair of distance pieces diametrically opposite to one another, each of which is adapted to embrace a considerable arc, I employ more than two and so arrange them as to afford proper abutments for the sides of the inserts against strain of the belt. Thus, when three are employed, they are placed at intervals of one hundred and twenty degrees around the opening, so that any pair of them may be considered as abutments disposed in an arc of that extent. As in the former case, I prefer to locate the abutting portion of the walls of the distance pieces 12, at a radial distance from the center of the opening, slightly greater than the distance of the wall of the opening itself therefrom, so as to form overhanging shoulders at the points adjacent to. the distance pieces, as shown in Fig. V. In this case, as in that previously described, the insert 13, of cork or otheiimaterial, is forced into position so as to expand both above and below the edge of the opening, and to rest upon the inner rim with the side abutting against the walls of the distance pieces 12. It will thus be seen that the distance pieces not only serve to maintain the outer and inner rims in the desired relation, so as to afiord seats of the requisite depth for the inserts, but that they embrace the sides of the latter in a manner which gives eflicient abutting support against strain in any direction.

Having thus described my invention, I desire to state that I do not broadly claim the use of inserts, as I am aware that various forms of pulleys have been devised to permit the employment thereof, nor do I claim broadly the employment of an outer and inner rim in connection with inserts.

I claim:

1. In a pulley, the combination, of an outer rim provided with a plurality of openings; inserts arranged in said openings; an inner rim adapted to support the lower ends of said inserts; distance pieces, arranged in proximity to the edges of said openings; and adapted to form abutments for the sides of the inserts; and means for securing the outer and inner rims in the described relation to one another, substantially as set forth.

2. In a pulley, the combination of an outer rim provided with a plurality of openings; inserts arranged in said openings; an inner rim adapted to support the lower ends of said inserts; distance pieces arranged in proximity to the edges of said openings and adapted to embrace the sides of the insert throughout arcs of relatively considerable extent; and means for securing the outer and inner rims in the described relation to one another, substantially as set forth.

In testimony whereof, I have hereunto signed my name, at Philadelphia, Pennsylvania, this eighth day of April, 1910.

CHARLES A. BRINLEY. 

